Have you ever wondered why, after defining an alias like about-us for, say, node/123, your pages are still riddled with those ugly machine-generated tabs and links like /node/123/edit, node/123/revisions etc.?
Likewise for /taxonomy/term/% and /user/% links: did you expect to see /dries/track but got /user/5/track?
Do you find that your browser address bar also shows those ugly numbers instead of your aliases?
Have you ever been annoyed that upon clicking the Edit tab on, say, the about-us page, blocks that you configured to be visible on all about-us/* pages suddenly disappear?
In short, would you like your human-readable, SEO-friendly aliases to be carried through on all your tabs, links, Views, and blocks, on all your pages, not just on that single aliased base path?
XHProf is a hierarchical profiler for PHP. It reports function-level call counts and inclusive and exclusive metrics such as wall (elapsed) time, CPU time and memory usage. A function's profile can be broken down by callers or callees. The raw data collection component is implemented in C as a PHP Zend extension called xhprof. XHProf has a simple HTML based user interface (written in PHP). The browser based UI for viewing profiler results makes it easy to view results or to share results with peers. A callgraph image view is also supported.
It also provides a native Drupal UI (as opposed to facebook's original php front end) to view the profiling data. Having this in Drupal provides several advantages:
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